The Latent Heat Exchange on the Ground

Abstract

Evapotranspiration is one of the important elements related water cycle and there is many kind of measurement method of evapotranspiration today. This study developed mini lysimeter for the purpose of direct measurement of evapotranspiration and installed on 5th, July, 2010 at the field of MRI which located at Tsukuba, Ibaraki, Japan for continuous measurement and understand relation between evapotranspiration and meteorological elements expecially radiation elements. And compared the evapotranspiration data of lysimeter with Bowen Ratio Method. The result of this study is as follows;There is high related with solar radiation and evapotranspiration with R 2 =0.947. and 46 % of solar radiation converted into evapotranspiration during clear 5 days. In net radiation also highly related with evapotranspiration, we can derive evapotranspiration is mainly controlled by radiation energy in clear days.From the 104 days data, there is only 9 % difference between Bowen Ratio Method and evapotranspiration of lysimeter which was developed from this study is very useful to estimate evapotranspiration at field site with simple and high accuracy.High accuracy and resolution measurement of evapotranspiration by lysimeter can give a chance further study of meteorological phenomena of on ground expecially in night time condensation which means abnormal energy flow.

Lysimeteric Evaluation for Transpiration and Carbon Accumulation of Kimchi Cabbage (Brassica rapa L. ssp. pekinensis)

“…라이시미터는 실제 증발산량을 측정하는 유일한 방법으로 평가되며 (Schrader et al, 2013) 작물의 물 사용량 (Marek et al, 1988;Martin et al, 2001;Bello and Van Rensburg, 2017;Kim et al, 2018;Ok et al, 2018), 토양수분 이동 분석 (Seo et al, 2016;Seo et al, 2017), 측정 방법간 상관관계 분석 (Tyagi et al, 2000), 모델의 정확성 검증 (Steiner et al, 1989;Colaizzi et al, 2006)에 기준 증발산량 평가법으로 활용되었고, 순복사량 (Lee and Haginoya, 2011)과 해발고도의 영향 (Lee et al, 2012)을 분석한 결과 기상조건에 따른 증발산량 변화를 평가하는데 매우 유용 하다고 하였다.…”